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Unread 02-20-2018, 11:05 AM
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pic: FRC Team 1501's, 2018 robot: Blackhawk

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Unread 02-20-2018, 11:06 AM
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Re: pic: FRC Team 1501's, 2018 robot: Blackhawk

1501 looked awesome last Sunday and they'll only be better by week 2. Watch out St. Joseph's District, 1501 is going to bring the heat.
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Unread 02-20-2018, 11:06 AM
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Re: pic: FRC Team 1501's, 2018 robot: Blackhawk

Quote:
FRC Team 10501
Didn't know we were on 5 digits already...

Robot looks great. The 850ms lift was ridiculously cool to watch!
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Unread 02-20-2018, 11:12 AM
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Re: pic: FRC Team 1501's, 2018 robot: Blackhawk

Clean looking robot guys!
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Unread 03-05-2018, 07:41 PM
a_rutledge a_rutledge is offline
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Re: pic: FRC Team 1501's, 2018 robot: Blackhawk

What kind of gearing and motors are you guys using on your lift? Seems like the fastest cascading elevator I've seen yet.
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Unread 03-05-2018, 08:30 PM
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Re: pic: FRC Team 1501's, 2018 robot: Blackhawk

Quote:
Originally Posted by a_rutledge View Post
What kind of gearing and motors are you guys using on your lift? Seems like the fastest cascading elevator I've seen yet.
Hi-speed is 7:1 overall. We had 3 mini-cim motors, now we have 2 mini-cim motors and a constant force spring. We are still the same speed going to 95" with a cube in tow. We went with mini-cim motors because we've had experience with elevators in 2011, 2015 and PID controls and know that they heat up pretty good due to stall conditions when holding a position. So rather than putting 775 pros on there with a brake system, we just kept it simple with a mini-cim that we can stall no problems. The motors get about 112 degrees F with 2.5 hours of practice on them, so not bad.
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Unread 03-05-2018, 08:48 PM
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Re: pic: FRC Team 1501's, 2018 robot: Blackhawk

Quote:
Originally Posted by Chris_Elston View Post
Hi-speed is 7:1 overall. We had 3 mini-cim motors, now we have 2 mini-cim motors and a constant force spring. We are still the same speed going to 95" with a cube in tow. We went with mini-cim motors because we've had experience with elevators in 2011, 2015 and PID controls and know that they heat up pretty good due to stall conditions when holding a position. So rather than putting 775 pros on there with a brake system, we just kept it simple with a mini-cim that we can stall no problems. The motors get about 112 degrees F with 2.5 hours of practice on them, so not bad.
What's the diameter of the output pulley of that 7:1 gearbox?

We are doing a single CIM at the moment, 6:1 with 1.5" diameter spool. Planning to switch to two CIMs. The CIMs seem to draw less current to hold position than miniCIMs, based on some math done a few weeks ago.
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Unread 03-05-2018, 08:51 PM
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Re: pic: FRC Team 1501's, 2018 robot: Blackhawk

Quote:
Originally Posted by s_forbes View Post
What's the diameter of the output pulley of that 7:1 gearbox?

We are doing a single CIM at the moment, 6:1 with 1.5" diameter spool. Planning to switch to two CIMs. The CIMs seem to draw less current to hold position than miniCIMs, based on some math done a few weeks ago.
We are using 2" diameter pulleys with 8mm HTD belts.
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